High Friction Mechanism of ZDDP Tribofilm Based on in situ AFM Observation of Nano-Friction and Adhesion Properties

Sato, Kaisei; Watanabe, Seiya; Sasaki, Shinya

doi:10.1007/s11249-022-01635-x

Cited by 14 publications

(4 citation statements)

References 58 publications

(131 reference statements)

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“…Tomale et al reported that the development of ZDDP tribofilm amplifies the adhesion force [61]. Kaisei et al also reported that the friction may increase because of the higher adhesion property of ZDDP [62]. These analyses also support the results in the current study; COF increased with ZDDP addition.…”

Section: Change In Surface Adhesion and Analysis Of Phase Profilesupporting

confidence: 89%

Synergistic Lubrication Mechanism of Nanodiamonds with Organic Friction Modifier

Piya,

Yang,

Al Sheikh Omar

et al. 2023

Preprint

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Section: Change In Surface Adhesion and Analysis Of Phase Profilesupporting

confidence: 89%

Synergistic Lubrication Mechanism of Nanodiamonds with Organic Friction Modifier

Piya,

Yang,

Al Sheikh Omar

et al. 2023

Preprint

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“…The differences shown are clearest as the lubrication regime worsens at top and bottom dead centre reversals indicating differences in interfacial boundary friction responsible for the variation in performance. It has been shown that thick phosphate ZDDP derived tribofilms on steel surfaces increase friction through roughening [37] and increased interfacial boundary shear stress [38,39]. However, it has previously been shown that ZDDP does not form thick tribofilms on Si-C and DLC surfaces, and that these films reduce friction on these non-ferrous surfaces Ueda et al [18], and Topolovec-Miklozic et al [40] have shown organic friction modifiers have little effect on friction on some non-ferrous surfaces.…”

Section: Discussionmentioning

confidence: 99%

On the Role of Friction Modifier Additives in the Oil Control Ring and Piston Liner Contact

Tomlinson,

Davison,

King

et al. 2024

Journal of Tribology

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In-cylinder internal combustion engine parasitic frictional losses continue to be an area of interest to improve efficiency and reduce emissions. This study investigates the frictional behaviour at the oil control ring-cylinder liner conjunction of lubricants with anti-wear additives, varying dispersant concentration and a range of friction modifiers. Experiments are conducted at a range of temperatures on a cylinder liner with a nickel silicon carbide coating. A novel motored reciprocating tribometer, with a complete three-piece oil control ring and cylinder liner, was used to isolate the friction at the segment-liner interfaces. Four lubricants were tested, three with the same 3% dispersant concentration and 1% ZDDP anti-wear additive: the first with no friction modifier, the second with inorganic friction modifier (molybdenum dithiocarbamates), and the third with organic friction modifier (amide). A fourth lubricant with organic friction modifier with a 9% dispersant concentration was tested to compare the effect of the level of dispersant with the friction modifier. Results indicate that the inorganic friction modifier reduces friction comparatively to the other lubricants, showing the importance of friction modifier selection with anti-wear additives.

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“…In addition, the high friction behavior of the ZDDP tribofilm has been consistently observed at the macroscale, irrespective of the sliding pair [18,26]. Kaisei Sato [27] utilized in situ Atomic Force Microscopy (AFM) to investigate the mechanism behind this high friction. Their studies revealed a significant correlation between the adhesion and nano-friction force, highlighting the substantial role played by the strong adhesion force of ZDDP tribofilm in generating elevated friction.…”

Section: Introductionmentioning

confidence: 99%

Impact of tribofilm on the anti-wear and friction-reduction properties of interfaces

Ge,

Lyu,

Zhang

et al. 2024

Phys. Scr.

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Zinc Dialkyl Dithiophosphate (ZDDP) is widely used in internal combustion engine lubricating oil, which forms tribofilm and effectively blocks the direct contact of the material interface. Tribofilm plays an important role in wear resistance and lubrication performance. This study analyses ZDDP additive lubricant performance and the tribofilm distribution under different concentrations and loads. Tribofilm formation and wear mechanism is characterized by Scanning electron microscope (SEM) and Energy dispersive X-ray spectrometer (EDS), and the lubrication performance is further explained by the Atomic Force Microscope (AFM). This study explored the anti-wear and friction-reducing properties of ZDDP tribofilm respectively, revealing that ZDDP tribofilm distribution plays a pivotal role in reducing wear, the wear amount can be reduced by 50%, but has a slight effect on friction-reducing, only 5.7%. In addition, the concentrations and loads significantly affect the growth of the tribofilm, and change the wear and lubrication characteristics. The tribofilm acts as a significant barrier, effectively protecting the surface from wear. However, excessive pressure may lead to the failure of the tribofilm, resulting in the loss of protection and subsequent severe wear of the surface. Furthermore, the mechanisms of lubrication are explained, wherein the tribofilm serves as micro-texture, reducing direct contact between asperities and thereby lowering the friction coefficient.

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High Friction Mechanism of ZDDP Tribofilm Based on in situ AFM Observation of Nano-Friction and Adhesion Properties

Cited by 14 publications

References 58 publications

Synergistic Lubrication Mechanism of Nanodiamonds with Organic Friction Modifier

Synergistic Lubrication Mechanism of Nanodiamonds with Organic Friction Modifier

On the Role of Friction Modifier Additives in the Oil Control Ring and Piston Liner Contact

Impact of tribofilm on the anti-wear and friction-reduction properties of interfaces

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